Gamanit: There is nothing wrong with tring to convince your students that you are correct. Brainwashing is when the convincing becomes subliminal. For example, when you are learning Math and the teacher says “When you will be in Yale, this will come in handy” is brainwashing, as Yale was brought in not as the class, but to send a message that you will be going to Yale as a fait accompli. That is opposed to a teacher getting up in class and giving a speech on the topic of why everyone should go to Yale, which would not be brainwashing, as the message is direct, not subliminal.
From Wikipedia (which admittedly is not the best source):
Mind control (also known as brainwashing, coercive persuasion, mind abuse, menticide, thought control, or thought reform) refers to a process in which a group or individual “systematically uses unethically manipulative methods to persuade others to conform to the wishes of the manipulator(s), often to the detriment of the person being manipulated”.[1] The term has been applied to any tactic, psychological or otherwise, which can be seen as subverting an individual’s sense of control over their own thinking, behavior, emotions or decision making.
(Emphasis added)